import {getTypeNamesFromFilter, type PartialDocumentList} from './DocumentList'
import {type StructureNode} from './StructureNodes'

/**
 * Intent parameters (json)
 *
 * @public
 */
export type IntentJsonParams = {[key: string]: any}

/**
 * Base intent parameters
 *
 * @public
 * @todo dedupe with core
 */
export interface BaseIntentParams {
  /**
   * Document schema type name to create/edit.
   * Required for `create` intents, optional for `edit` (but encouraged, safer and faster)
   */
  type?: string

  /**
   * ID of the document to create/edit.
   * Required for `edit` intents, optional for `create`.
   */
  id?: string

  /**
   * Name (ID) of initial value template to use for `create` intent. Optional.
   */
  template?: string

  /**
   * Experimental field path
   *
   * @beta
   * @experimental
   * @hidden
   */
  path?: string

  /**
   * Optional "mode" to use for edit intent.
   * Known modes are `structure` and `presentation`.
   */
  mode?: string

  /**
   * Arbitrary/custom parameters are generally discouraged - try to keep them to a minimum,
   * or use `payload` (arbitrary JSON-serializable object) instead.
   */
  [key: string]: string | undefined
}

/** @internal */
export const DEFAULT_INTENT_HANDLER = Symbol('Document type list canHandleIntent')

/**
 * Intent parameters
 * See {@link router.BaseIntentParams} and {@link router.IntentJsonParams}
 *
 * @public
 */
export type IntentParams = BaseIntentParams | [BaseIntentParams, IntentJsonParams]

/**
 * Interface for intents
 * @public */
// TODO: intents should be unified somewhere
export interface Intent {
  /** Intent type */
  type: string
  /** Intent parameters. See {@link IntentParams}
   */
  params?: IntentParams
}

/**
 * Interface for intent checker
 *
 * @public
 */
export interface IntentChecker {
  (
    /** Intent name */
    intentName: string,
    /** Intent checker parameter */
    params: {[key: string]: any},
    /** Structure context. See {@link StructureNode} */
    context: {pane: StructureNode; index: number},
  ): boolean
  /** intent checker identify */
  identity?: symbol
}

/** @internal */
export const defaultIntentChecker: IntentChecker = (intentName, params, {pane}): boolean => {
  const isEdit = intentName === 'edit'
  const isCreate = intentName === 'create'
  const typedSpec = pane as PartialDocumentList
  const paneFilter = typedSpec.options?.filter || ''
  const paneParams = typedSpec.options?.params || {}
  const typeNames = typedSpec.schemaTypeName
    ? [typedSpec.schemaTypeName]
    : getTypeNamesFromFilter(paneFilter, paneParams)

  const initialValueTemplates = typedSpec.initialValueTemplates || []

  if (isCreate && params.template) {
    return initialValueTemplates.some((tpl) => tpl.templateId === params.template)
  }

  return (
    (isEdit && params.id && typeNames.includes(params.type)) ||
    (isCreate && typeNames.includes(params.type))
  )
}

defaultIntentChecker.identity = DEFAULT_INTENT_HANDLER